{"event":{"id":"evt-hist-20260923-mentalhealthbench","dedupe_key":"benchmark_release:2026-09-23:openai-publishes-mentalhealthbench-expert-informed-model-evaluation-benchmark","event_type":"benchmark_release","title":"OpenAI publishes MentalHealthBench expert-informed model evaluation benchmark","summary":"OpenAI published MentalHealthBench on September 23 2026 with input from more than 80 licensed mental-health experts to evaluate model responses in simulated conversations. This is an evaluation-method publication, not medical device approval, clinical effectiveness proof or substantiation that an AI replaces professional care.","occurred_at":"2026-09-23T00:00:00.000Z","published_at":"2026-09-23T00:00:00.000Z","observed_at":"2026-10-17T20:20:00.000Z","reconstructed_at":"2026-10-17T20:20:00.000Z","ingest_type":"historical_backfill","locations":null,"status":"verified","confidence":0.92,"metadata":{"date_precision":"day","external_postcutoff_id":"2026-09-23-openai-mentalhealthbench","evidence_only":1,"global_novelty_unproven":1,"new_relation_onset":0,"reported_claims_not_independently_audited":1},"created_at":"2026-10-18T05:48:53.081Z","updated_at":"2026-10-18T05:48:53.081Z"},"artifacts":[{"id":"art-hist-20260923-mentalhealthbench","dedupe_key":"05932c2e4bfe272c509f16be972726d48c70c6a011c58bffdb2ac63ea75036ee","canonical_url":"https://openai.com/index/introducing-mentalhealthbench/","evidence_locator":"","artifact_type":"original_publisher_publication","title":"OpenAI publishes MentalHealthBench expert-informed model evaluation benchmark","summary":"","creator_entities":[],"released_at":"2026-09-23T00:00:00.000Z","content_hash":null,"metadata":[],"created_at":"2026-10-18T05:48:53.081Z","updated_at":"2026-10-18T05:48:53.081Z","relation":"documented_by"}],"signals":[]}